はじめまして!
Hello!
Ciao! :)
I'm a Postdoctoral Researcher at the Kavli Institute for the Physics and Mathematics of the Universe (IPMU), by The University of Tokyo. My main research focus is dark matter in galaxies, which I study with gravitational lensing.
I obtained my PhD at the University of California, Santa Barbara, with the thesis "Luminous and dark matter in early-type galaxies". Before then I lived in beautiful Lucca, Italy, where I was born and raised, and did my studies at Università di Pisa.

Contact Information:


Email address:


Kavli Institute for the Physics and Mathematics of the Universe
The University of Tokyo
5-1-5 Kashiwanoha
Kashiwa, 277-8583
Japan

Curriculum vitae




Research Interests


I am part of the Hyper Suprime-Cam strong lensing working group, currently involved in the Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). The aim of SuGOHI is to collect a large sample of strong lenses, taking advantage of the amazing data produced by HSC, and use them to study the structure of massive galaxies, galaxy groups and clusters and to measure cosmological parameters with time-delay measurements of strongly lensed quasars. Click here to see a list of candidate strong lenses found in HSC.


Selected publications:

Updated 2017-4-5

Sonnenfeld, A.; Nipoti, C.; Treu, T.;
"Merger-driven evolution of the effective stellar initial mass function of massive early-type galaxies"
2016, Monthly Notices of the Royal Astronomical Society, 465, 2397

Sonnenfeld, A.; Treu, T.; Marshall, P. J.; Suyu, S. H.; Gavazzi, R.; Auger, M. W.; Nipoti, C.
"The SL2S Galaxy-scale Lens Sample. V. Dark Matter Halos and Stellar IMF of Massive ETGs out to Redshift 0.8"
2015, The Astrophysical Journal, 800, 94

Sonnenfeld, A.; Nipoti, C.; Treu, T.;
"Purely Dry Mergers do not Explain the Observed Evolution of Massive Early-type Galaxies"
2014, The Astrophysical Journal, 786, 89

Sonnenfeld, A.; Treu, T.; Gavazzi, R.; Suyu, S. H.; Marshall, P. J.; Auger, M. W.; Nipoti, C.
"The SL2S Galaxy-scale Lens Sample. IV. The dependence of the total mass density profile of early-type galaxies on redshift, stellar mass, and size"
2013, The Astrophysical Journal, 777, 98

Sonnenfeld, A.; Gavazzi, R.; Suyu, S. H.; Treu, T.; Marshall, P. J.
"The SL2S Galaxy-scale Lens Sample. III. Lens Models, Surface Photometry and Stellar Masses for the final sample"
2013, The Astrophysical Journal, 777, 97

Sonnenfeld, A.; Treu, T.; Gavazzi, R.; Marshall, P. J.; Auger, M. W.; Suyu, S. H.; Koopmans, L. V. E.; Bolton, A. S.
"Evidence for Dark Matter Contraction and a Salpeter Initial Mass Function in a Massive Early-type Galaxy"
2012, The Astrophysical Journal, 752, 163

Sonnenfeld, A.; Bertin, G.; Lombardi, M.
Direct measurement of the magnification produced by galaxy clusters as gravitational lenses
2011, Astronomy & Astrophysics, 532, 37